The transfer function bake-off
Pfister, H.; Lorensen, B.; Bajaj, C.; Kindlmann, G.; Schroeder, W.; Avila, L.S.; Raghu, K.M.; Machiraju, R.; Jinho Lee
Computer Graphics and Applications, IEEE
Volume 21, Issue 3, May/Jun 2001 Page(s):16 - 22
Digital Object Identifier   10.1109/38.920623
Summary:Direct volume rendering is a key technology for visualizing large 3D data sets from scientific or medical applications. Transfer functions are particularly important to the quality of direct volume-rendered images. A transfer function assigns optical properties, such as color and opacity, to original values of the data set being visualized. Unfortunately, finding good transfer functions proves difficult. It is one of the major problems in volume visualization. The article examines four of the currently most promising approaches to transfer function design. The four approaches are: trial and error, with minimum computer aid; data-centric, with no underlying assumed model; data-centric, using an underlying data model; and image-centric, using organized sampling

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